Phase behavior of binary mixture of palmitoleic acid (cis-9-hexadecenoic acid) and asclepic acid (cis-11-octadecenoic acid)

✍ Scribed by Tohru Inoue; Isamu Motoda; Nobuyasu Hiramatsu; Masao Suzuki; Kiyotaka Sato

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 420 KB
• Volume: 66
• Category: Article
• ISSN: 0009-3084
• DOI: 10.1016/0009-3084(93)90007-p

✦ Synopsis

The influence of difference in A chain length of cis-monounsaturated fatty acids on the phase behavior of their binary mixtures was examined based on the phase diagram of the mixture composed of palmitoleic acid (Ci6; o~7, A9) and asclepic acid (Cls; ~7, A11). The phase diagram exhibited a 'eutectic-like' pattern, which demonstrates that the two components are perfectly miscible in liquid phase but much less miscible in solid phase (u-phase). This is in contrast to the case of binary mixtures composed of counter-combination of fatty acids with the same A-but different u-chain length, where it was found that the molecular compounds are formed in the solid phase and the compounds are miscible with each component at least in the ~t phase. The present results provide further evidence for the critical importance of the matching in A chain length for determining the phase behavior of cis-monounsaturated fatty acid mixtures.